Greatest Common Factor of 21, 12, 83, 821

Greatest common factor or Greatest common divisor (GCD) can be calculated in two ways

• Greatest Common Factor of 21, 12, 83, 821 by common division method
• Greatest Common Factor of 21, 12, 83, 821 with matching the biggest common factor

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∴ GCF of numbers is 1 because of no common factors present between them.

Factors of 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Factors of 12

List of positive integer factors of 12 that divides 12 without a remainder.

1,2,3,4,6,12

Factors of 83

List of positive integer factors of 83 that divides 83 without a remainder.

1,83

Factors of 821

List of positive integer factors of 821 that divides 821 without a remainder.

1,821

Greatest Common Factor

We found the factors 21,12,83,821 . The biggest common factor number is the GCF number.
So the greatest common factor 21,12,83,821 is 1.

Here are some samples of GCF of two or more Numbers calculations.

• GCF of 88, 34, 14, 919
• GCF of 81, 21, 53, 172
• GCF of 43, 82, 99, 281
• GCF of 69, 78, 64, 486
• GCF of 54, 80, 56, 936

1. What is the GCF of 21, 12, 83, 821?

Answer: GCF of 21, 12, 83, 821 is 1.

2. How to Find the GCF of 21, 12, 83, 821

Answer: Greatest Common Factor(GCF) of 21, 12, 83, 821 = 1

Step 1: Divide all the numbers with common prime numbers having remainder zero.

Step 2: Then multiply all the prime factors GCF(21, 12, 83, 821) = 1.